EP0144305A1 - Process and apparatus for the treatment of the thermal decomposition of organic substances - Google Patents

Process and apparatus for the treatment of the thermal decomposition of organic substances Download PDF

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Publication number
EP0144305A1
EP0144305A1 EP84890214A EP84890214A EP0144305A1 EP 0144305 A1 EP0144305 A1 EP 0144305A1 EP 84890214 A EP84890214 A EP 84890214A EP 84890214 A EP84890214 A EP 84890214A EP 0144305 A1 EP0144305 A1 EP 0144305A1
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Prior art keywords
process water
biological
wastewater treatment
amount
metered
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German (de)
French (fr)
Inventor
Wolfgang Dipl.-Ing. Stuckart
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Voestalpine AG
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Voestalpine AG
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/1231—Treatments of toxic sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/006—Regulation methods for biological treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/11—Turbidity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to a process for working up process water from a thermal decomposition of organic substances, in particular from pyrolysis or conversion plants, and to an apparatus for carrying out this process.
  • a number of processes for sludge or waste disposal are known, in which the feed material is heated under anaerobic conditions, an aqueous phase being formed which contains the vapor condensate and distillation products obtained during drying.
  • This aqueous phase which is called process water below, contains a high degree of organic substances which are biodegradable and has a relatively high biological oxygen requirement for its degradation.
  • a particular disadvantage in the processing of this process water is that this process water represents a strong odor nuisance.
  • the biological oxygen requirement of such process water is particularly high when it comes to aqueous distillates.
  • mixed sewage systems in which dirty water and rainwater are transported in one and the same sewer, the sewage plant inflow naturally fluctuates in quantity depending on the amount of precipitation.
  • the nutrient concentration in the wastewater fluctuates and thus also its biological oxygen demand.
  • the invention now aims to process the process water arising in the course of the thermal decomposition of organic substances in a particularly simple manner with a minimum of odor nuisance, without significant changes to the existing systems in their structure or their dimensions.
  • the invention essentially consists in that the process water is fed to a gas-tight collecting container and a biological wastewater treatment stage is metered in from this collecting container.
  • the fluctuating nutrient content can be compensated for to a relatively large extent by metering in process water, and it can occur at times when that is to be worked up.
  • Wastewater is relatively pure, by metering in process water rich in organic substances, the biological wastewater treatment stage can be operated at a relatively uniform level.
  • the process is advantageously carried out in such a way that the process water is metered into the biological wastewater treatment stage in an amount which is inversely proportional to the nutrient concentration of the wastewater.
  • Turbidity measurements or chromatographic determinations of the organic fraction can be used as a measure of the contamination of the wastewater to be cleaned.
  • the measure of the nutrient concentration can be derived in a particularly simple manner directly from the wastewater. If the wastewater treatment plant is supplied with large amounts of wastewater and the average value for the amount of wastewater is known, the increased supply of wastewater or the increased amount of wastewater can be used to directly infer the nutrient concentration.
  • a high volume therefore means a lower concentration of nutrients and by adding process water, this lower nutrient concentration can reach a predetermined value be raised.
  • the procedure according to the invention is such that the amount of waste water flowing into the waste water treatment plant is measured in wastewater treatment plants in the course of a mixed sewerage system, and that the process water is metered into the biological waste water treatment stage in a proportion proportional to the inflow amount.
  • a direct regulation of the dosage of the process water quantity can take place in such a way that the process water quantity is regulated depending on the quantity of waste water supplied to the biological waste water purification stage in the time unit.
  • the device required for this is designed according to the invention in such a way that a gas-tight collecting container is connected to the process water drainage of a conversion or pyrolysis reactor, that the collecting container is connected via a line with the interposition of a controllable feed pump and / or a controllable metering valve Supply to biological cleaning stage of a wastewater treatment plant is connected to the fact that another pump with variable delivery volume and / or a flow meter is switched on in the line to the biological cleaning stage and that the drive of the feed pump (s) and / or the flow meter and / or the actuator of the metering valve with a Control circuit are connected.
  • the odor nuisance can be kept low and a buffer storage is formed, from which the desired amount of process water is derived and metered in according to the signals of the control circuit of the biological cleaning stage. Since the process water usually arises from a thermal decomposition of the sludge cake resulting from thickening and dewatering from the secondary clarifier of the same wastewater treatment plant, this process water can be conducted in a closed circuit and processed directly in the plant in which the sludge to be processed is produced.
  • the device according to the invention can advantageously be further developed such that the control circuit is connected to signal lines for the measurement values of a concentration determination of the nutrient concentration in the inflowing wastewater and / or the signal lines from turbidity sensors in the primary settling tank.
  • 1 denotes a primary clarifier, to which the waste water is fed to a mixed sewer system via a line 2.
  • the amount of water produced is subjected to a flow rate measurement at 3, the amount which can be worked up in the subsequent biological stage, which is designated by 4, being fed to this biological stage.
  • the material which has been biodegraded and largely cleaned in this way passes into a secondary clarifier 5, from which the sludge is subjected to a thickening and dewatering via a discharge device 6, for example by screen belt or filter belt presses, as they are designated by 7.
  • the resulting sludge cake is fed by a conveyor 8 to a thermal decomposition reactor, for example a conversion reactor 9, in which extensive drying also takes place. Solid constituents such as coal are discharged from this reactor 9 via a discharge device 10 and liquid oils are discharged via a line 11.
  • the resulting process water is fed via line 12 to a gas-tight collecting container 13, from which it can be withdrawn again via line 14.
  • control circuit 15 denotes a control circuit, to which the signals of the flow rate measurement at 3 are supplied.
  • this control circuit can be assigned a turbidity sensor 16, which can be connected to this control circuit 15 via a signal line 17.
  • the metering valve 19 is opened or closed via a control line 18, the opening and closing taking place as a function of the measured flow rate whenever a mixed sewage system is involved.
  • a feed pump with variable Delivery volume can be provided, and instead of the metering valve 19, a variable delivery pump can also be arranged without changing the basic structure.
  • the process water is thus circulated, which significantly reduces the odor nuisance.
  • Correspondingly purified water is drawn off from the secondary clarifier via a line 20 and fed to the receiving water.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Toxicology (AREA)
  • Molecular Biology (AREA)
  • Treatment Of Sludge (AREA)
  • Activated Sludge Processes (AREA)

Abstract

The treatment of process water from a thermal decomposition of organic substances entails this water being stored temporarily in a gas-tight collecting tank and being metered into a biological effluent purification stage in amounts which are inversely proportional to the nutrient concentration in the effluent. For this purpose, the process water line (12) of a converting or pyrolysis reactor (9) is connected to a gas-tight collecting tank (13) from which process water can be metered through a line (14) and controllable metering valve (19) into the biological effluent purification stage (4) of an effluent purification plant. A control circuit (15) is provided for controlling the metering valve (14) and is connected to signal lines for the measurements of a concentration determination of the nutrient concentration in the inflowing effluent and/or to the signal lines of turbidity sensors (16) in the preliminary clarification tank (1). <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zum Aufarbeiten von Prozeßwasser aus einer thermischen Zersetzung von organischen Substanzen, insbesondere aus Pyrolyse- bzw. Konvertierungsanlagen, sowie auf eine Vorrichtung zur Durchführung dieses Verfahrens.The invention relates to a process for working up process water from a thermal decomposition of organic substances, in particular from pyrolysis or conversion plants, and to an apparatus for carrying out this process.

Es sind eine Reihe von Verfahren zur Schlamm- bzw. Müllentsorgung bekannt, bei welchen das Einsatzmaterial unter anaeroben Verhältnissen erhitzt wird, wobei eine wässerige Phase entsteht, welche das bei der Trocknung anfallende Brüdenkondensat und Destillationsprodukte enthält. Diese wässerige Phase, welche nachfolgend Prozeßwasser genannt wird, enthält in hohem Maße organische Substanzen, welche biologisch abbaubar sind, und weist einen relativ hohen biologischen Sauerstoffbedarf für seinen Abbau auf. Ein besonderer Nachteil bei der Aufarbeitung dieses Prozeßwassers ist dadurch gegeben, daß dieses Prozeßwasser eine starke Geruchsbelästigung darstellt. Der biologische Sauerstoffbedarf eines derartigen Prozeßwassers ist insbesondere dann sehr hoch, wenn es sich um wässerige Destillate handelt.A number of processes for sludge or waste disposal are known, in which the feed material is heated under anaerobic conditions, an aqueous phase being formed which contains the vapor condensate and distillation products obtained during drying. This aqueous phase, which is called process water below, contains a high degree of organic substances which are biodegradable and has a relatively high biological oxygen requirement for its degradation. A particular disadvantage in the processing of this process water is that this process water represents a strong odor nuisance. The biological oxygen requirement of such process water is particularly high when it comes to aqueous distillates.

Bei sogenannten Mischkanalisationen, bei welchen Schmutzwasser und Regenwasser in ein und demselben Kanal befördert wird, schwankt naturgemäß der Kläranlagenzulauf mengenmäßig in Abhängigkeit von der Niederschlagsmenge. Abhängig von zeitlichen Faktoren, beispielsweise der tageszeitlich bedingten Spitze der Belastung des Abwassers zu bestimmten Zeiten und in Abhängigkeit von der Verdünnung des Schmutzwassers durch das Regenwasser, schwankt die Nährstoffkonzentration im Abwasser und damit auch ihr biologischer Sauerstoffbedarf.In so-called mixed sewage systems, in which dirty water and rainwater are transported in one and the same sewer, the sewage plant inflow naturally fluctuates in quantity depending on the amount of precipitation. Depending on the temporal factors, for example the peak of the wastewater load at certain times of the day and depending on the dilution of the wastewater by the rainwater, the nutrient concentration in the wastewater fluctuates and thus also its biological oxygen demand.

Die Erfindung zielt nun darauf ab, das im Zuge der thermischen Zersetzung von organischen Substanzen entstehende Prozeßwasser mit einem Minimum an Geruchsbelästigung in besonders einfacher Weise aufzuarbeiten, ohne daß hiebei bestehende Anlagen in ihrem Aufbau oder in ihrer Dimensionierung nennenswert geändert werden müssen. Zur Lösung dieser Aufgabe besteht die Erfindung im wesentlichen darin, daß das Prozeßwasser einem gasdichten Sammelbehälter zugeführt wird und aus diesem Sammelbehälter einer biologischen Abwasserreinigungsstufe zudosiert wird. Insbesondere bei Abwasserreinigungsanlagen, bei welchen das Abwasser einer Mischkanalisation aufgearbeitet wird, kann durch das Zudosieren von Prozeßwasser der schwankende Nährstoffgehalt relativ weitgehend kompensiert werden und es kann zu Zeiten, zu welchen das aufzuarbeitende. Abwasser relativ rein ist, durch Zudosieren von an organischen Substanzen reichem Prozeßwasser die biologische Abwasserreinigungsstufe auf relativ gleichförmigem Niveau betrieben werden.The invention now aims to process the process water arising in the course of the thermal decomposition of organic substances in a particularly simple manner with a minimum of odor nuisance, without significant changes to the existing systems in their structure or their dimensions. To achieve this object, the invention essentially consists in that the process water is fed to a gas-tight collecting container and a biological wastewater treatment stage is metered in from this collecting container. In the case of wastewater treatment plants in particular, in which the wastewater from a mixed sewerage system is worked up, the fluctuating nutrient content can be compensated for to a relatively large extent by metering in process water, and it can occur at times when that is to be worked up. Wastewater is relatively pure, by metering in process water rich in organic substances, the biological wastewater treatment stage can be operated at a relatively uniform level.

In vorteilhafter Weise wird hiebei so vorgegangen, daß das Prozeßwasser in einer Menge, welche der Nährstoffkonzentration des Abwassers umgekehrt proportional ist, der biologischen Abwasserreinigungsstufe zudosiert wird. Als Maß für die Verunreinigung des zu reinigenden Abwassers können hiebei Trübungsmeßwerte oder chromatographische Bestimmungen des organischen Anteiles herangezogen werden. Bei einer Mischkanalisation läßt sich das Maß der Nährstoffkonzentration in besonders einfacher Weise unmittelbar aus dem Abwasseranfall ableiten. Wenn der Abwasserreinigungsanlage hohe Mengen an Abwasser zugeführt werden und der durchschnittliche Wert für die anfallende Abwassermenge bekannt ist, läßt sich aus der erhöhten Zufuhr an Abwasser bzw. der erhöhten Abwassermenge unmittelbar auf die Nährstoffkonzentration schließen. Ein hoher Mengenanfall bedeutet somit geringere Konzentration an Nährstoffen und durch Zudosieren von Prozeßwasser kann diese geringere Nährstoffkonzentration auf einen vorbestimmten Wert angehoben werden. Zu diesem Zwecke wird im Rahmen des erfindungsgemäßen Verfahrens so vorgegangen, daß in Abwasserreinigungsanlagen im Zuge einer Mischkanalisation die der Abwasserreinigungsanlage zufließende Abwassermenge gemessen wird und daß das Prozeßwasser in einer zur Zuflußmenge proportionalen Menge der biologischen Abwasserreinigungsstufe zudosiert wird. Eine unmittelbare Regelung der Dosierung der Prozeßwassermenge kann so erfolgen, daß die Prozeßwassermenge in Abhängigkeit von der der biologischen Abwasserreinigungsstufe in der Zeiteinheit zugeführten Abwassermenge geregelt wird.The process is advantageously carried out in such a way that the process water is metered into the biological wastewater treatment stage in an amount which is inversely proportional to the nutrient concentration of the wastewater. Turbidity measurements or chromatographic determinations of the organic fraction can be used as a measure of the contamination of the wastewater to be cleaned. In the case of a mixed sewage system, the measure of the nutrient concentration can be derived in a particularly simple manner directly from the wastewater. If the wastewater treatment plant is supplied with large amounts of wastewater and the average value for the amount of wastewater is known, the increased supply of wastewater or the increased amount of wastewater can be used to directly infer the nutrient concentration. A high volume therefore means a lower concentration of nutrients and by adding process water, this lower nutrient concentration can reach a predetermined value be raised. For this purpose, the procedure according to the invention is such that the amount of waste water flowing into the waste water treatment plant is measured in wastewater treatment plants in the course of a mixed sewerage system, and that the process water is metered into the biological waste water treatment stage in a proportion proportional to the inflow amount. A direct regulation of the dosage of the process water quantity can take place in such a way that the process water quantity is regulated depending on the quantity of waste water supplied to the biological waste water purification stage in the time unit.

Durch all diese Maßnahmen ist es möglich, die biologische Stufe, welche im besonderen mit Vorteil als aerobe biologische Reinigungsstufe ausgebildet ist, in ihren Dimensionen unverändert belassen. Bei hohen Mengen an anfallendem Prozeßwasser kann es jedoch günstig sein, die biologische Reinigungsstufe geringfügig zu vergrößern, wobei sich am Verfahrensablauf prinzipiell jedoch nichts ändert. Die Verdünnung der Prozeßwässer durch das Abwasser ist aufgrund der gewählten Abhängigkeit von der Nährstoffkonzentration immer relativ groß und im wesentlichen konstant, so daß die Geruchsbelästigung auf ein Minimum reduziert werden kann. Derartige Vorteile könnten mit einer konstanten Zudosierung von Prozeßwasser in keiner Weise erreicht werden, da dann zusätzlich zu den Konzentrationsschwankungen der Nährstoffe in den angelieferten Abwässern noch die relativ hohe und konstante Belastung durch die Prozeßwässer hinzukäme.All of these measures make it possible to leave the dimensions of the biological stage, which is particularly advantageously designed as an aerobic biological purification stage. In the case of high amounts of process water, however, it can be expedient to increase the biological purification level slightly, but in principle nothing changes in the course of the process. The dilution of the process water by the wastewater is always relatively large and essentially constant due to the chosen dependence on the nutrient concentration, so that the odor nuisance can be reduced to a minimum. Such advantages could in no way be achieved with a constant addition of process water, since in addition to the fluctuations in the concentration of nutrients in the delivered wastewater, the relatively high and constant load from the process water would then be added.

Zur Durchführung des erfindungsgemäßen Verfahrens ist die hiefür erforderliche Vorrichtung gemäß der Erfindung so ausgebildet, daß an die Prozeßwasserableitung eines Konvertierungs- oder Pyrolysereaktors ein gasdichter Sammelbehälter angeschlossen ist, daß der Sammelbehälter über eine Leitung unter Zwischenschaltung einer regelbaren Förderpumpe und/oder eines regelbaren Dosierventiles mit der Zuleitung zur biologischen Reinigungsstufe einer Abwasserreinigungsanlage verbunden ist, daß in die Leitung zur biologischen Reinigungsstufe eine weitere Pumpe mit veränderlichem Fördervolumen und/oder ein Durchflußmengenmesser eingeschaltet ist und daß der Antrieb der Förderpumpe(n) und/oder der Durchflußmengenmesser und/oder der Stellantrieb des Dosierventils mit einer Regelschaltung verbunden sind. Durch den gasdichten Sammelbehälter kann hiebei die Geruchsbelästigung gering gehalten werden und es wird ein Pufferspeicher ausgebildet, aus welchem die jeweils gewünschte Menge an Prozeßwasser abgeleitet wird und entsprechend den Signalen der Regelschaltung der biologischen Reinigungsstufe zudosiert wird. Da das Prozeßwasser in der Regel aus einer thermischen Zersetzung des durch Eindicken und Entwässerung entstandenen Schlammkuchens aus dem Nachklärbecken der gleichen Abwasserreinigungsanlage entsteht, kann dieses Prozeßwasser im geschlossenen Kreislauf geführt werden und unmittelbar in derjenigen Anlage verarbeitet werden, in welcher auch der aufzuarbeitende Schlamm entsteht. Da mit Vorteil die Zudosierung zur biologischen Stufe der Abwasserreinigung so erfolgt, daß die Nährstoffkonzentration bei kontinuierlichem Beschicken der biologischen Abwasserreinigungsstufe konstant gehalten wird, ergeben sich verfahrenstechnisch Vorteile in Bezug auf die Ausbeuten der biologischen Umsetzung, da die Biozönose der biologischen Stufe in einfacher Weise in einem konstanten Milieu gehalten wird.To carry out the method according to the invention, the device required for this is designed according to the invention in such a way that a gas-tight collecting container is connected to the process water drainage of a conversion or pyrolysis reactor, that the collecting container is connected via a line with the interposition of a controllable feed pump and / or a controllable metering valve Supply to biological cleaning stage of a wastewater treatment plant is connected to the fact that another pump with variable delivery volume and / or a flow meter is switched on in the line to the biological cleaning stage and that the drive of the feed pump (s) and / or the flow meter and / or the actuator of the metering valve with a Control circuit are connected. Due to the gas-tight collecting container, the odor nuisance can be kept low and a buffer storage is formed, from which the desired amount of process water is derived and metered in according to the signals of the control circuit of the biological cleaning stage. Since the process water usually arises from a thermal decomposition of the sludge cake resulting from thickening and dewatering from the secondary clarifier of the same wastewater treatment plant, this process water can be conducted in a closed circuit and processed directly in the plant in which the sludge to be processed is produced. Since the metering to the biological stage of wastewater treatment is advantageously carried out in such a way that the nutrient concentration is kept constant with continuous loading of the biological wastewater treatment stage, there are procedural advantages with regard to the yields of the biological conversion, since the biocenosis of the biological stage is simple in one constant milieu is maintained.

Zusätzlich zu der mit Vorteil auf eine Durchflußmengenmessung gestützten Regelung kann die erfindungsgemäße Vorrichtung mit Vorteil so weitergebildet werden, daß die Regelschaltung mit Signalleitungen für die Meßwerte einer Konzentrationsbestimmung der Nährstoffkonzentration im zufließenden Abwasser und/oder den Signalleitungen von Trübungssensoren im Vorklärbecken verbunden ist.In addition to the control, which is advantageously based on a flow rate measurement, the device according to the invention can advantageously be further developed such that the control circuit is connected to signal lines for the measurement values of a concentration determination of the nutrient concentration in the inflowing wastewater and / or the signal lines from turbidity sensors in the primary settling tank.

Die Erfindung wird nachfolgend anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles näher erläutert.The invention is explained in more detail below on the basis of an exemplary embodiment shown schematically in the drawing.

In der Zeichnung ist mit 1 ein Vorklärbecken bezeichnet, welchem über eine Leitung 2 das Abwasser einer Mischkanalisation zugeführt wird. Die anfallende Wassermenge wird einer Durchflußmengenmessung bei 3 unterworfen, wobei diejenige Menge, welche in der nachfolgenden biologischen Stufe, welche mit 4 bezeichnet ist, aufgearbeitet werden kann, dieser biologischen Stufe zugeführt wird. Das auf diese Weise biologisch abgebaute und weitgehend gereinigte Material gelangt in ein Nachklärbecken 5, aus welchem der Schlamm über eine Austragvorrichtung 6 einer Eindickung und Entwässerung, beispielsweise durch Siebband- oder Filterbandpressen, wie sie mit 7 bezeichnet sind, unterworfen wird. Der entstehende Schlammkuchen wird durch eine Fördervorrichtung 8 einem Reaktor für die thermische Zersetzung, beispielsweise einem Konvertierungsreaktor 9, zugeführt, in welchem auch eine weitgehende Trocknung erfolgt. Aus diesem Reaktor 9 werden über eine Austragsvorrichtung 10 feste Bestandteile, wie Kohle, und über eine Leitung 11 flüssige öle ausgetragen. Das entstehende Prozeßwasser wird über eine Leitung 12 einem gasdichten Sammelbehälter 13 zugeführt, aus welchem es über eine Leitung 14 wieder abgezogen werden kann.In the drawing, 1 denotes a primary clarifier, to which the waste water is fed to a mixed sewer system via a line 2. The amount of water produced is subjected to a flow rate measurement at 3, the amount which can be worked up in the subsequent biological stage, which is designated by 4, being fed to this biological stage. The material which has been biodegraded and largely cleaned in this way passes into a secondary clarifier 5, from which the sludge is subjected to a thickening and dewatering via a discharge device 6, for example by screen belt or filter belt presses, as they are designated by 7. The resulting sludge cake is fed by a conveyor 8 to a thermal decomposition reactor, for example a conversion reactor 9, in which extensive drying also takes place. Solid constituents such as coal are discharged from this reactor 9 via a discharge device 10 and liquid oils are discharged via a line 11. The resulting process water is fed via line 12 to a gas-tight collecting container 13, from which it can be withdrawn again via line 14.

Mit 15 ist eine Regelschaltung bezeichnet, welcher die Signale der Durchflußmengenmessung bei 3 zugeführt sind. Zusätzlich kann dieser Regelschaltung ein Trübungssensor 16 zugeordnet sein, welcher über eine Signalleitung 17 mit dieser Regelschaltung 15 verbunden sein kann. Über eine Steuerleitung 18 wird das Dosierventil 19 geöffnet oder geschlossen, wobei das öffnen und Schließen in Abhängigkeit von der gemessenen Durchflußmenge immer dann erfolgt, wenn es sich um eine Mischkanalisation handelt. Anstelle der Durchflußmengenmessung bei 3 kann eine Förderpumpe mit variablem Fördervolumen vorgesehen sein, und anstelle des Dosierventiles 19 kann ebenso eine variable Förderpumpe angeordnet werden, ohne daß hiebei der prinzipielle Aufbau geändert wird.15 denotes a control circuit, to which the signals of the flow rate measurement at 3 are supplied. In addition, this control circuit can be assigned a turbidity sensor 16, which can be connected to this control circuit 15 via a signal line 17. The metering valve 19 is opened or closed via a control line 18, the opening and closing taking place as a function of the measured flow rate whenever a mixed sewage system is involved. Instead of the flow rate measurement at 3, a feed pump with variable Delivery volume can be provided, and instead of the metering valve 19, a variable delivery pump can also be arranged without changing the basic structure.

Das Prozeßwasser wird somit im Kreislauf geführt, wodurch die Geruchsbelästigung wesentlich verringert wird. Vom Nachklärbecken wird entsprechend gereinigtes Wasser über eine Leitung 20 abgezogen und dem Vorfluter zugeleitet.The process water is thus circulated, which significantly reduces the odor nuisance. Correspondingly purified water is drawn off from the secondary clarifier via a line 20 and fed to the receiving water.

Claims (7)

1. Verfahren zum Aufarbeiten von Prozeßwasser aus einer thermischen Zersetzung von organischen Substanzen, insbesondere aus Pyrolyse- bzw. Konvertierungsanlagen, dadurch gekennzeichnet, daß das Prozeßwasser einem gasdichten Sammelbehälter (13) zugeführt wird und aus diesem Sammelbehälter (13) einer biologischen Abwasserreinigungsstufe (4) zudosiert wird.1. A process for working up process water from a thermal decomposition of organic substances, in particular from pyrolysis or conversion plants, characterized in that the process water is supplied to a gas-tight collecting container (13) and from this collecting container (13) a biological waste water purification stage (4) is metered. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Prozeßwasser in einer Menge, welche der Nährstoffkonzentration des Abwassers umgekehrt proportional ist, der biologischen Abwasserreinigungsstufe (4) zudosiert wird.2. The method according to claim 1, characterized in that the process water is metered in an amount which is inversely proportional to the nutrient concentration of the wastewater, the biological wastewater treatment stage (4). 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß in Abwasserreinigungsanlagen im Zuge einer Mischkanalisation die der Abwasserreinigungsanlage zufließende Abwassermenge gemessen wird und daß das Prozeßwasser in einer zur Zuflußmenge proportionalen Menge der biologischen Abwasserreinigungsstufe (4) zudosiert wird.3. The method according to claim 1 or 2, characterized in that in wastewater treatment plants in the course of a mixed sewerage the amount of wastewater flowing to the wastewater treatment plant is measured and that the process water is metered in a proportion to the inflow amount of the biological wastewater treatment stage (4). 4. Verfahren nach einem der Ansprüche 1, 2 oder 3, dadurch gekennzeichnet, daß die Prozeßwassermenge in Abhängigkeit von der der biologischen Abwasserreinigungsstufe (4) in der Zeiteinheit zugeführten Abwassermenge geregelt wird.4. The method according to any one of claims 1, 2 or 3, characterized in that the amount of process water is regulated in dependence on the amount of waste water supplied in the unit time of biological wastewater treatment (4). 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Zudosierung zur biologischen Abwasserreinigungsstufe (4) so erfolgt, daß die Nährstoffkonzentration bei kontinuierlichem Beschicken der biologischen Abwasserreinigungsstufe (4) konstant gehalten wird.5. The method according to any one of claims 1 to 4, characterized in that the addition to the biological wastewater treatment stage (4) is carried out so that the nutrient concentration is kept constant with continuous loading of the biological wastewater treatment stage (4). 6. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß an die Prozeßwasserableitung (12) eines Konvertierungs- oder Pyrolysereaktors (9) ein gasdichter Sammelbehälter (13) angeschlossen ist, daß der Sammelbehälter (13) über eine Leitung (14) unter Zwischenschaltung einer regelbaren Förderpumpe und/oder eines regelbaren Dosierventiles (19) mit der Zuleitung zur biologischen Abwasserreinigungsstufe (4) einer Abwasserreinigungsanlage verbunden ist, daß in die Leitung zur biologischen Reinigungsstufe eine weitere Pumpe mit veränderlichem Fördervolumen und/oder ein Durchflußmengenmesser (3) eingeschaltet ist und daß der Antrieb der Förderpumpe(n) und/oder der Durchflußmengenmesser (3) und/oder der Stellantrieb des Dosierventils (19) mit einer Regelschaltung (15) verbunden sind.6. Device for performing the method according to one of claims 1 to 5, characterized in that to the Process water drainage (12) of a conversion or pyrolysis reactor (9) a gas-tight collection container (13) is connected so that the collection container (13) via a line (14) with the interposition of a controllable feed pump and / or a controllable metering valve (19) with the feed line is connected to the biological wastewater treatment stage (4) of a wastewater treatment plant that a further pump with variable delivery volume and / or a flow meter (3) is switched on in the line to the biological treatment stage and that the drive of the feed pump (s) and / or the flow rate meter (3 ) and / or the actuator of the metering valve (19) are connected to a control circuit (15). 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß die Regelschaltung (15) mit Signalleitungen für die Meßwerte einer Konzentrationsbestimmung der Nährstoffkonzentration im zufließenden Abwasser und/oder den Signalleitungen von Trübungssensoren (16) im Vorklärbecken (1) verbunden ist.7. The device according to claim 6, characterized in that the control circuit (15) with signal lines for the measured values of a concentration determination of the nutrient concentration in the inflowing wastewater and / or the signal lines of turbidity sensors (16) in the primary clarifier (1) is connected.
EP84890214A 1983-11-28 1984-11-13 Process and apparatus for the treatment of the thermal decomposition of organic substances Withdrawn EP0144305A1 (en)

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AT4162/83 1983-11-28

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2318116A1 (en) * 1975-07-14 1977-02-11 Sulzer Ag METHOD AND DEVICE FOR MONITORING AND ADJUSTING THE BIOLOGICAL ACTIVITY OF MICRO-ORGANISMS OF A BIOLOGICAL SEWERWATER STATION
FR2422602A1 (en) * 1978-04-11 1979-11-09 Sgn Soc Gen Tech Nouvelle Pretreating strongly organic effluent from wine prodn. etc. - with daytime intermittent peak loads smoothed for steady overnight discharge
DE2909333A1 (en) * 1979-03-09 1980-09-18 Linde Ag METHOD FOR BIOLOGICAL WASTE WATER TREATMENT
EP0033930A1 (en) * 1980-02-08 1981-08-19 Schering Aktiengesellschaft Method of equalizing the load of contaminants in a stream of waste water

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2318116A1 (en) * 1975-07-14 1977-02-11 Sulzer Ag METHOD AND DEVICE FOR MONITORING AND ADJUSTING THE BIOLOGICAL ACTIVITY OF MICRO-ORGANISMS OF A BIOLOGICAL SEWERWATER STATION
FR2422602A1 (en) * 1978-04-11 1979-11-09 Sgn Soc Gen Tech Nouvelle Pretreating strongly organic effluent from wine prodn. etc. - with daytime intermittent peak loads smoothed for steady overnight discharge
DE2909333A1 (en) * 1979-03-09 1980-09-18 Linde Ag METHOD FOR BIOLOGICAL WASTE WATER TREATMENT
EP0033930A1 (en) * 1980-02-08 1981-08-19 Schering Aktiengesellschaft Method of equalizing the load of contaminants in a stream of waste water

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Title
BBC-NACHRICHTEN, Band 58, Nr.6/7, 1976, Seiten 232-238, BROWN-BOVERI , MANNHEIM, (DE). J. LENSCHOW: "Prozessfuhrung und Informationsverarbeitung in Kl{ranlagen". * Seite 235, Absatz : " Ausgleich der Schmutzfracht " ; Seite 237, Absatz : " Steuerung der biologischen Stufe ".* *
CHEMICAL ABSTRACTS, Band 74, Nr.108. Marz 1971, Seite 210,211. Nr. 45387a, COLUMBUS, OHIO, (US). N.P. DROZDOV et al.: "Purification of a complex mixture of waste waters from a wood-chemical industrial complex". & Gidroliz. Lesokhim. Prom. 1970, 23(8), 3-4. *

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